NLB-2000 petrol engine impact wrench is mainly used to tighten rail fasteners in railway construction ormaintenance operations. Tightening or loosening of nuts on bolts and splints. The machine adopts theprinciple of energy superposition and utilizes the instantaneous peak torque. The method of repeatedimpact action is used to tighten or loosen the nut. This machine is compact in structure, light in weightand portable. lt is convenient to tighten and loosen the nuts on the connecting bolts arranged in diferentdirections, such as vertical, horizontal and inclined. Especially for the nut which is not easy to loosen dueto corrosion and other reasons, the use of this wrench has its unique effect.